HTML 輸入元素只讀屬性

HTML input readonly 屬性用於宣告 input 元素不可修改，但仍然可以複製。

來看一個 Input readOnly 屬性的示例 −

示例

<!DOCTYPE html>
<html>
<head>
<title>Input Email readOnly</title>
<style>
   form {
      width:70%;
      margin: 0 auto;
      text-align: center;
   }
   * {
      padding: 2px;
      margin:5px;
   }
   input[type="button"] {
      border-radius: 10px;
   }
</style>
</head>
<body>
<form>
<fieldset>
<legend>Email-readOnly</legend>
<label for="EmailSelect">Contact Us :
<input type="email" id="EmailSelect" onclick="showErrorMsg()" value="infoHelpDesk@MNC.com" readOnly>
</label>
<input type="button" onclick="showMessage()" value="Copy Email Id">
<div id="divDisplay"></div>
</fieldset>
</form>
<script>
   var divDisplay = document.getElementById("divDisplay");
   var inputEmail = document.getElementById("EmailSelect");
   divDisplay.textContent = 'Above email is read-only';
   function showMessage() {
      inputEmail.select();
      document.execCommand('copy');
      divDisplay.textContent = 'Email Copied: '+inputEmail.value;
   }
   function showErrorMsg(){
      divDisplay.textContent +=', This cannot be edited.'
   }
</script>
</body>
</html>

這將產生以下輸出 −

1) 在點選“複製郵箱”按鈕之前 −